High contrast liquid crystal display devices

Details High contrast liquid crystal display devices High contrast liquid crystal display devices

G - Physics

02

F

375/39, 314/7, 3

G02F 1/133 (2006.01) G02F 1/1335 (2006.01) G02F 1/139 (2006.01)

Patent

CA 1216052

ABSTRACT A liquid cyrstal display device having high extinction ratio polarizers on the input and output sides of a transmissive, twisted nematic liquid crystal cell. The liquid crystal cell incorporating a dichroic dye which is admixed with the liquid crystal material. The high extinction ratio polarizers get the full contrast and density capability from the liquid crytal cell while the dichroic dye prevents the buildup of the contrast limiting orthogonal mode of the polarized light passing therethrough, thus, further increasing the optical contrast and density. Such an arrangement provides optical contrasts of around 150:1 with a 10 micron thick liquid cyrstal cell.

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